Transcript Chapter 3 Notes Part I Quantitative/qualitative Accuracy/precision Standard Units & Metric Conversions Types of Measurements • Qualitative-measurements describing the qualities or characteristics of something • Quantitative-measurements that focus on.

Chapter 3 Notes Part I
Quantitative/qualitative
Accuracy/precision
Standard Units &
Metric Conversions
Types of Measurements
• Qualitative-measurements
describing the qualities or
characteristics of something
• Quantitative-measurements
that focus on actual
numerical data
What type of data is the
following:
• The beaker is hot.
• The beaker is 37oC.
• A yellow precipitate forms.
• Water has a density of
1.0g/ml.
Accuracy vs. Precision
• Accuracy-how close a
measurement is to the actual
value.
• Precision-how close a set of
measurements are to each
other.
What is an example of:
-something both accurate
and precise.
-something precise but
not accurate.
-something accurate but
not precise.
What is the Metric System?
• Also Called International
System (SI)
• Based on factors of ten
Why use metrics in science?
• Factors of ten are much
easier to work with.
• Research does not just occur
in the U.S.—a global
community requires a
universal measuring system.
Standard Units
• Length
• Mass
• Time
• Temperature
• Amount of substance
Standard Units
• Length - meter
• Mass - kilogram
• Time - second
• Temperature - °C
• Amount of substance - mole
Derived Units
• Area
• Volume
• Density
• Concentration
• Energy
Derived Units
• Area – square meter
• Volume – cubic meter
• Density – kg/m3
• Concentration – moles/Liter
• Energy - Joules
Metric Prefixes
• Each prefix signifies an
amount of base units
represented.
• Remember: King Henry…
• Kilo1000
• Hecto100
• Deka10
• Base unit
• Deci.1 or 1/10th
• Centi.01 or 1/100th
• Milli.001 or 1/1000th
Other prefixes
• Mega- 1 000 000
• Giga- 1 000 000 000
• Tera- 1 000 000 000 000
• Micro- .00001 or 1/1000000th
• Nano- .000000001 or 1/billon
• Pico- .000000000001